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HT49C70L Datasheet(PDF) 4 Page - Holtek Semiconductor Inc |
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HT49C70L Datasheet(HTML) 4 Page - Holtek Semiconductor Inc |
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4 / 44 page  Pad Description Pad Name I/O Options Description PA0/BZ PA1/BZ PA2 PA3/PFD PA4~PA7 I/O Wake-up Pull-high or None CMOS or NMOS PA0~PA7 constitute an 8-bit bidirectional input/output port with Schmitt trig- ger input capability. Each pin on port can be configured as wake-up input by options. PA0~PA3 can be configured as CMOS output or NMOS input/output with or without pull-high resistor by options. PA4~PA7 are always pull-high NMOS input/output. Of the eight bits, PA0~PA1 can be set as I/O pins or buzzer outputs by options. PA3 can be set as an I/O pin or as a PFD output also by options. PB0/INT0 PB1/INT1 PB2/TMR0 PB3/TMR1 PB4~PB7 I ¾ PB0~PB7 constitute an 8-bit Schmitt trigger input port. Each pin on port are with pull-high resistor. Of the eight bits, PB0 and PB1 can be set as input pins or as external interrupt control pins (INT0) and (INT1) respectively, by soft- ware application. PB2 and PB3 can be set as an input pin or as a timer/event counter input pin TMR0 and TMR1 also by software application. PC0~PC7 I/O Pull-high or None CMOS or NMOS PC0~PC7 constitute an 8-bit bidirectional input/output port with Schmitt trig- ger input capability. On the port, such can be configured as CMOS output or NMOS input/output with or without pull-high resistor by options. V2 I ¾ Voltage pump for HT49R70A-1/HT49C70-1. LCD power supply for HT49C70L. VLCD I ¾ LCD power supply for HT49R70A-1/HT49C70-1. Voltage pump for HT49C70L. V1, C1, C2 I ¾ Voltage pump COM0~COM2 COM3/SEG40 O 1/2, 1/3or1/4 Duty SEG40 can be set as a segment or as a common output driver for LCD panel by options. COM0~COM2 are outputs for LCD panel plate. SEG0~SEG39 O ¾ LCD driver outputs for LCD panel segments OSC1 OSC2 I O Crystal or RC OSC1 and OSC2 are connected to an RC network or a crystal (by options) for the internal system clock. In the case of RC operation, OSC2 is the output ter- minal for 1/4 system clock. The system clock may come from the RTC oscillator. If the system clock co- mes from RTCOSC, these two pins can be floating. OSC3 OSC4 I O RTC or System Clock Real time clock oscillators. OSC3 and OSC4 are connected to a 32768Hz crystal oscillator for timing purposes or to a system clock source (depending on the options). No built-in capacitor VDD ¾¾ Positive power supply VSS ¾¾ Negative power supply, ground RES I ¾ Schmitt trigger reset input, active low HT49R70A-1/HT49C70-1/HT49C70L Rev. 2.40 4 July 30, 2012 |
Similar Part No. - HT49C70L_12 |
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Similar Description - HT49C70L_12 |
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